Feed-water heating and purifying means.



R. W. PARRY. FEED WATER HEATING AND PURIFYING MEANS.

APPLICATION FILED JAN.1Z,1911.

Patented June 17, 1913.

m W a Cut iota.

FEED-WATER HEATING AND PURIFYING MEANS.

Specification of Letters Patent.

Patented June 1 7/, ifi i3.

Application filed January 12, 1911. Serial No. 602.335.

To all to/mm may concern Be it known that I, RICHARD \V. PARRY, of Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements inl eeddVater Heating and Purifying lilcans; and I do hereby declare the following to he a full, clear, and exact description of the invention, such as will enable others skilled in the art. to which it appertains to make and use the same.

This invention "relates to improvements in feed water heating and purifying means, one object of the invention being to provide feed water heaters which can be operated either as open or closed heaters, and which shall he arranged in series in such manner that any one or more can be excluded from service.

A further object is to provide means in a steam-coil feed water heater, for suddenly chilling the coil to cause contraction of the same for the purpose of cracking or dislodging scale-forming material from the coil.

TVith these objects in view the invention consists in certain novel features of construction and combinations of parts as hereinafter set forth and pointed out in the claim.

The accompanying drawing is a View illust-rating' a feed water heating and purifying; system embodyingniy improven'icnts.

My improved system comprises a series of feed water heating and purifying units and any'desired number of these units may be employed,foi-ir being shown in the drawings as indicated at 1. 2, 3 and a. Each of these units may be disposed vertically as shown at 1, 2 and 4, or one or all of .them may be disposed horizontally as shown at 3. Each unit comprises a cylinder 5 provided in its lower port-ion with a suitable settlhng chamber and with the latter a valved blow-oft device 6 is connected. The cylinder 5 may be closed by means of a cover '4" or it may be left open to the atmosphere when used as an open heater. Located within the cylinder is a coil 8 preferably of copper tubing and at one side of this coil, a screen 9 is located: One end of the coil 8 communicates with a pipe 10 to receive steam as hereinafter explained and the other end of said coil communicates a pipe 11 to receive condensation fromwith the coil. The pipes 10 which communicate l (l l -to flow by means of a pipe with the coils in the units 1, 2 and 3 are connected by means of pipes 12 with a main 1; through which exhaust steam is supplied and inthe circuit of this main, an oil separator ll is located. A valved water pipe [5 communicates with the cylinder of the lirst'unit at one side of the coil and screen therein and a valved pipe 16 communicates at one end with,the cylinder of the first unit at the opposite side of the screen and the other end of this pipe commnnicates with the cylinder of the next unit. The unit 2 is connected in like manner with the unit by means of a valved pipe 17 and the cylinder of the unit 3 connected by means of a valved pipe 18 with a pump From this pump, the water will bc causcd 20 to the unit fl and t'rom the latter, by means of a valved pipe 21 to the boiler. The unit 1: which is located between the pump and the boiler is of the closed heater type and the coil 'wilhin the cylinder of this unit may be supplied with either live or exhaust steam from any suitable source. by means of a pipe and the condensation from this coil is discharged through a pipe 23. The water re 'sulting from the' condensation of steam in the coils of units 1, 2, 3, will be discharged through the pipe 11 to a common main 24 by which it canhc conveyed ti? the source of water supply or to other place where itmay be utilized. Valved by-passes 25 are provided around the cylinders of the several f units and connected at their respective ends with the water pipes at respective sides of the several cylinders.

With each steam pipe 10, a valved cold water pipe 26 communicates for the purpose of supplying cold water to the steam coils to accomplish results which will now be explained.

During the operation of a heater, more or less scale forming material will accumulate on the heating coil. In order that this material shall be"cracked and dislodged the heater or unit will first be excluded from the system by means of the valved-bypass 25 and then (after first closing-the steam supply to the coil) cold Water will be passed "through the coil from the cold water pipe 26,-the ettectof this cold water on the coil being; to suddenly chill the latter and cause sulhcient contraction thereof to crack the adhering coating of scale forming material and permitting the dislodgment of the same.

The major portion of the scale forming material thus dislodged from the coil will become precipitated in the settling chamber of the cylinder but any particles which might remain in suspension in the water will be prevented from reaching the water exit side-of the cylinder by means of the screen 9 and this screen will also prevent the escape of other flocculent matter to the water exit side of the cylinder.

The blow-offs of the several cylinders can be operated without excluding the cylinder from the system but in order to cause the removal of the scale forming material from the coils, as above explained, it is necessary to exclude the unit from the system, but it is evident that any one or more of the units might be thus excluded without aitecting the proper and etlicient operation of the others.

It will be observed that the circulation of water through the various units will be comparatively slow and for this reason a maximum amount of the impurities which mi ght be contained in the water will be precipitated. If desired chemical materials may be employed to increase or accelerate the precipitation of solids or scale forming material.

Having fully described my-invention what I claim as new and desire to secure by Letters-Patent, is

In a feed water heater, the combination with a cylinder and feed water supply and discharge pipes therefor, of a heating coil within the cylinder, pipes for conducting steam through the coil, and suitable valves for cutting off the supply of steam to the coil and independent pipes for conducting cold water through said heating coil-for removing the scale formed on its exterior surface, substantially as set forth.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

RICHARD WILLIAM PARRY.

Witnesses JouN' E. DRAKE,

Roy M. BENJAMIN. 

